fix: update next.js version to ^15.5.12 in package.json and pnpm-lock.yaml

Author: hotlong

apps/web/package.json

@@ -12,7 +12,7 @@
     "@objectos/auth": "workspace:*",
     "better-auth": "^1.4.18",
     "better-sqlite3": "^12.6.0",
-    "next": "^15.1.4",
+    "next": "^15.5.12",
     "react": "^19.0.0",
     "react-dom": "^19.0.0"
   },